Part of the Center for the Sciences and Innovation (CSI), Marrs McLean Hall, an inviting and spacious facility, serves as the hub of Trinity's mathematics, geosciences, and physics research with outstanding laboratory and computing facilities.

Fast Facts:
  • CSI has been certified as a LEED Gold facility and incorporates several sustainability measures, including a landscaped bioswale that captures and filters rainwater​​​​​
Front view of Marrs McLean Hall.
Hours of operation

Monday-Friday: 7 a.m. - 10 p.m.
Saturday: 9 a.m. - 6 p.m.
Sunday: Noon - 10 p.m.


Inside the Venue

Take a look inside and outside of the Marrs Mclean building

  Virtual Tour - Exterior   Virtual Tour - Interior

Marrs McLean Observatory

The Marrs McLean Observatory provides students with intensive hands-on experiences in astronomy. We have eight computer-controlled Schmidt-Cassegrain telescopes, including six with 8" apertures, one with 12" apertures on our observation deck, and one with 16"apertures permanently mounted in its own dome.

Marrs McLean Observatory


Academic Departments

Marrs McLean Hall houses the Departments of Physics and Astronomy, Geosciences, and Mathematics.


Directions and Parking

Address: East Hollywood Ave, San Antonio, TX 78212


Directions to Marrs McLean Hall

Events and Booking Information

Upcoming Events



Booking Information

Tiger Faculty and Staff

Host an Event

Planning a large event or activity? Contact Conferences and Special Programs for more information about event planning on Trintiy’s campus.

Reserve a Space or Place

Make individual space or room reservations through T-Space at tspace.trinity.edu. You’ll need your Trinity network username and password, and an idea about the date, time, location, and size of your event.

Students: Reach out to a faculty or staff sponsor for more information on event planning and space reservations.

Community Members

Host an Event

Want to use a facility or space on Trinity’s campus for your next large event or activity? Contact Conferences and Special Programs for more information.

Reserve a Space or Place

Rooms, halls, and outdoor spaces can be reserved for events such as guest lectures, meetings, or other smaller activities. Contact Conferences and Special Programs for more information.